Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
dinh lai » dinh lam, dinh lap, dinh tai
te sach » toc sach
ky sang » ky dang, ky tang, duy sang
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky sang) or (ky nang)) xa hoi. hieu van pham duc va dinh lai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky nang)) xa hoi. hieu van pham duc va dinh lai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) or (ky nang)) xa hoi. hieu van pham duc va dinh lai ((cua tre) OR (cuu tre))*".